Confusion around Anapanasati

I am having lots of doubt around breath meditation practice and was hoping the people in this community could offer some guidance. I've been practicing for a couple of years, daily 45-1 hour. I've always done breath meditation by focusing on the nostril area, and have been able to achieve good states of samadhi and occasionally jhana from this method. However, I believe I have been mostly "over-efforting" doing this approach - after several months I went through a phase where my mind refused to cooperate and I couldn't do any breath meditation for quite a long time as when I would go to sit there would be huge amounts of aversion and craving.

After a while of switching practices I am back to trying breath meditation but confused about several aspects: exactly how much should awareness be focussed on the relatively narrow area of the nostrils versus the rest of the body? Should it proceed in stages - so is it ok to restrict awareness to this narrow area to begin with, then once absorbed to try to broaden it to notice breathing in the entire body and then keep this as the main practice? Or should I be focusing on the narrow area and every few minutes perhaps widening awareness to include a few breaths throughout the whole body? My issue is that I feel as though when I deviate from my focus on the narrow area, I have a tendency to 'lose' that thread of concentration/deepening - hence why I wonder if it is worth staying with the narrow area until a significant level of quietening/absorption has happened?

There is also confusion over tensions arising: I hear some teachers say a focus should be on letting go of any tensions arising in the body - but to do this I need to split my attention somewhat, giving rise to the problem I outlined above. My biggest concern is that by focusing so much on the narrow area, I am somehow not meditating "properly" as I am missing this broader view of the body and its tensions. But then I have also experienced profound samadhi and jhana from this method, hence my doubts.

Finally I am confused as to what extent this practice should feel enjoyable or pleasurable. I often hear sentiments like if you are not enjoying it you are not practicing - but sometimes/often breath meditation can feel like a bit of an endurance - especially to begin with/until the mind quietens. I know how to meet hindrances and cultivate joy or appreciation, and this helps, but sometimes it still doesn't feel that good. Is this also a sign I'm doing something wrong?

My hunch would be that despite trying to relax over-efforting, there is still fearful/tense energy in the system which is making it difficult for me to trust that I can momentarily or eventually widen awareness and still retain/build samadhi. I would appreciate any advice or if anybody might recommend a teacher that would also be appreciated.